
The Tioga River and Cowanesque River valleys define the landscape of this northern Pennsylvania region during a period of significant hydrological change. Revisions from the 1980s illustrate the impact of flood control projects, showing the expansion of Cowanesque Lake and the Tioga Dam, which created the Tioga Reservoir and the Crooked Hammond Reservoir. These major water bodies transformed the valley floor near settlements like Tioga, Nelson, and Tompkins.
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4 editions found
1900 · Tioga
USGS Topo · 1:62,500
1900 · Elkland
USGS Topo · 1:62,500
1902 · Tioga
USGS Topo · 1:62,500
1914 · Corning
USGS Topo · 1:62,500
1924 · Woodhull
USGS Topo · 1:48,000
1926 · Woodhull
USGS Topo · 1:62,500
1944 · Woodhull
USGS Topo · 1:62,500
1944 · Corning
USGS Topo · 1:62,500
1950 · Elmira
USGS Topo · 1:250,000
1953 · Borden
USGS Topo · 1:24,000